[Kenwood] TS-930 Roofing Filter

[Tom LeClerc W1TJL]

I have heard one in operation (before and after) and I think it made a
great improvement - no measurements, just my ears.  George is working
on a roofing filter mod for my rig, the TS-950SDX and I can't wait!!!!
 :-)

73, Tom W1TJL

On 3/8/07, Bill Tippett <btippett at alum.mit.edu> wrote:
>
>
> K4CZ:
>  >Has anyone installed and used Inrad's TS-930 roofing filter? Would
> appreciate any feedback, particularly regarding use in contesting.
>
>         Yes and it makes a noticeable improvement.
> You can see the comparison of the stock and Inrad filters
> on page 1 below:
>
> http://www.qth.com/inrad/TS930-Roofing-Filter-Manual.pdf
>
> However, the 930 is still susceptible to IMD products
> from interfering signals that fall inside the roofing
> filter bandwidth.  The critical area for roofing filters
> is about 30 to 35 dB down on the skirts.  You can see
> above the Inrad has about 3.5 times less bandwidth than
> the stock filter at 30 dB down, plus its ultimate
> rejection is much better (>70 dB versus ~35).
>
>                                         73,  Bill  W4ZV
>
> P.S.  Not anywhere close to an Orion (my other rig) but
> definitely a worthwhile improvement.
>
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-- 
Tom LeClerc, Amateur Radio Station W1TJL
 (past calls WB1CBY, /VE8,XL8,VO1)

          LeClerc Consulting
         email: w1tjl at arrl.net
        PC/Network Consulting